Retractable pen



FIG. 1 is a front perspective view of a retractable pen in accordance with the new design;

FIG. 2 is a front elevational view of the retractable pen of FIG. 1;

FIG. 3 is a side elevational view of the retractable pen of FIG. 1;

FIG. 4 is a rear elevational view of the retractable pen of FIG. 1;

FIG. 5 is a top plan view of the retractable pen of FIG. 1; and,

FIG. 6 is a bottom plan view of the retractable pen of FIG. 1. 

The ornamental design for a retractable pen, as shown and described. 